Read the procedural document.Under normal use, a vehicle’s cabin air filter should be replaced every 8–12 months. Replacing the cabin air filter is a minor task, taking only a few minutes, but skipping it altogether is bad for your health. It can even reduce the life of your vehicle’s air-conditioning system.To change your vehicle’s cabin air filter, follow these simple steps:1. Open the glove box. Remove the screw and slide the hook out as shown.2. Push in each side of the glove box to disconnect it.3. Remove the filter case by holding both sides.4. Remove the filter from the filter case.5. Inspect the filter surface.If the filter is just moderately dusty, you can clean it by blowing compressed air from the reverse side. Do not wash or oil the filter.If the filter is dirty, it should be replaced.Which revision would most make this document more helpful to someone replacing a cabin air filter?